MQ Normal Operating Temp??

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MQ Normal Operating Temp??

Postby seb7701 on Sat Dec 14, 2019 10:37 am

Hi all.

Recently switched from my beloved MN to MQ and would love to know what normal operating temps people are seeing, especially when towing. With SCAN gauge, was seeing as much a 114ish on some hills with an empty 8x5 box trailer and around 95-105 on highway.

I removed my 9in spotlights this morning (Ironman b/bar) and did see around 10 degrees drop straight up (without trailer), but the MQ temp seems to be very sensitive to any kind of load compared to the previous MN. Makes me wonder how the hell anyone tows 2 or 3 tonne without the temp going crazy??

Any experiences would be appreciated.

Cheers, Seb
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Re: MQ Normal Operating Temp??

Postby DibbyDibbyDJ on Sat Dec 14, 2019 11:45 am

Bull bar will be restricting airflow through radiator too
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Re: MQ Normal Operating Temp??

Postby RHKTriton on Sat Dec 14, 2019 11:55 am

Could always be a suss thermostat or viscous clutch on fan.

If the cooling system is up to scratch I wouldn't expect to much increase in temp, diesels generally run pretty cool 80 to 90s compared to petrol units.
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Re: MQ Normal Operating Temp??

Postby harmigera on Sat Dec 14, 2019 12:06 pm

When towing a 1500kg camper trailer, I find at highway speeds, the temperature usually sits at 85-90C, whether it is level or going up a small hill. Recently going up the Clyde near Batemans Bay, the car was working hard and going slow, but it only got up to 105C, as soon as I got over the top and picked up speed, she quickly dropped backed to 85C.
I only have a nudge bar with small light bar.
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Re: MQ Normal Operating Temp??

Postby gartam on Sat Dec 14, 2019 3:08 pm

Mine sits on 86C on highway and around town. It will see 94C when it's getting a thrashing. The auto sits around the same.
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Re: MQ Normal Operating Temp??

Postby seb7701 on Sat Dec 14, 2019 3:44 pm

Thanks gents - really appreciate the feedback.

The behaviour with the camper is about what I recall from my MN, but I just did a quick test driving up the Toowoomba range at the speed limit and saw top of 109 degrees in an unladen Ute with two people, so I am buggered if I know how I could possibly tow anything up the range, even backing off just a fraction??

Around town is still prob 85 deg but a highway run this morning sees the temp rise and fall with every single hill and dip which just seems wrong - unless the EDS is telling fibs?? Oh, and surely the bull bar can’t be that big of an issue?
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Re: MQ Normal Operating Temp??

Postby RHKTriton on Sun Dec 15, 2019 7:19 am

Have you checked the gap between the radiator and AC cores? Amazing what can gather here.
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Re: MQ Normal Operating Temp??

Postby seb7701 on Sun Dec 15, 2019 9:53 am

Thanks - I’ll take a look, but the car has only 12000 kms on the clock and is basically new.
Just heading home now and seeing 85 in town but a solid 95 deg on Hwy which seems crazy with the extra airflow. Then car just seems stupidly sensitive to load like it’s already on the brink of co9ling tolerance. Surely something’s not right, so hoping something like bad thermostat or fan coupling maybe??
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Re: MQ Normal Operating Temp??

Postby DibbyDibbyDJ on Sun Dec 15, 2019 10:56 am

Most certainly worth checking the radiator for mud or something cutting airflow.

I haven't seen any MQ with a dodgy thermostat or viscous coupling, so very unlikely.

Bull bars are notorious for changing airflow and causing overheating problems.

And in your original post you said removing the lights caused a 10 degree drop.

Airflow, airflow, airflow
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Re: MQ Normal Operating Temp??

Postby seb7701 on Sun Dec 15, 2019 1:28 pm

Everything is clear. Whilst I can imagine some interference to airflow, the Ironman bar is really no different to 99% of bars fitted to every other ute, including the likes of ARB, so are they all running around on the brink of overheating or is ignorance bliss without a scantool??

I don't suppose there's anyone out there with an Ironman Bar and some comparison temperatures at all??
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Re: MQ Normal Operating Temp??

Postby Sky Miner on Sun Dec 15, 2019 5:34 pm

Mine sits around 86c so sounds about rite ;)
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Re: MQ Normal Operating Temp??

Postby seb7701 on Sun Dec 15, 2019 6:28 pm

Thanks mate - any comparisons are appreciated.

Interestingly I recalled the bullbar installer handing me some plastic pieces after the install and upon checking today, realised that they were the side right-angle air dams. So took the bullbar off this arvo and am in the midst of re-installing these plastic bits which hopefully prevent air leakage from around the sides to some degree.

This will be interesting...
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Re: MQ Normal Operating Temp??

Postby RHKTriton on Sun Dec 15, 2019 7:15 pm

Plastic infills! Sheer luxury!

On my ml, there were two chunks of foam rubber jambed into the gap between the radiator core and chassis.
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Re: MQ Normal Operating Temp??

Postby seb7701 on Sun Dec 15, 2019 8:14 pm

Still holding some faith in those bits of plastic!!
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Re: MQ Normal Operating Temp??

Postby WUNSIE on Mon Dec 16, 2019 5:20 pm

Those plastic infills serve a purpose, same as the shroud on the radiator, it allows the fan to draw the air through the radiator
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Re: MQ Normal Operating Temp??

Postby andelect on Mon Dec 16, 2019 7:52 pm

Instruction on the Smartbar I had fitted, "remove and discard Air Ram", which was on RH side below and on inner side of RH Head light. Poor photo in instructions shows plastic moulding, appearing to direct air into motor bay. Gone and i'll never know exactly where it rammed air.
FYI temps are normal around city and highway flat 86-88C. Long climb 8 km @100 kph up Adelaide freeway from toll gate to summit can bring temp to up 95 -105C pending on day temp, but quick to cool back to 86C once the throttle is off. The Smartbar has a grill allowing air into the intercooler finning, but the grill is quite restrictive, reckon only allowing 50% air flow. Have been thinking of removing this grill for a while, but difficulty to unscrew from the inside.
Never took reading before it got fitted.
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Re: MQ Normal Operating Temp??

Postby seb7701 on Mon Dec 16, 2019 8:11 pm

Again, thank for thought and temps. I’ve reinstalled the air dams so will see what happens.i still think that 98-100 deg cruising at 110km/h on the highway is plain wrong and as watching 5 degree increases with anything looking like a hill. I would have thought there should be plenty of cooling in reserve with a car these days to allow for that supposed 3T towing ability. At this rate, mine would blow with a decent tow load!!

Whilst the Ironman bullbar looks like 99% of other bars, I am noticing that Tojo and Mitsi factory bars all have giant intakes in the bar section itself, much the same as the original bumper does. Ironman has a long skinny slot, ARB’s is a bit bigger and TJM looks, well, actually pretty good.
Yep, I may consider a different bar, but def. sucks having to get new flares, bumper and all the bits that hold them on. At least bumpers would be dime a dozen...
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Re: MQ Normal Operating Temp??

Postby seb7701 on Tue Dec 17, 2019 11:48 am

Well bugger me - those little bits of plastic are pretty impressive!

Temps lower by about 5-8 degrees on Hwy but far less temp sensitive and doesn't start climbing on hills nearly as quickly as before...just be interesting to know whether it would be far better again with a more ventilated b/bar...
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Re: MQ Normal Operating Temp??

Postby WUNSIE on Tue Dec 17, 2019 4:55 pm

See mate its always the so called stupid little things that work collectively that shine through at the end of the day, good to hear they made a difference and how lucky are you to have them handed back, :P
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Re: MQ Normal Operating Temp??

Postby RHKTriton on Tue Dec 17, 2019 7:15 pm

Is there a solid bash plate or cover panel going back from the bull bar?

Maybe, if so, you could modify it to form a vent or air scoop.
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Re: MQ Normal Operating Temp??

Postby seb7701 on Tue Dec 17, 2019 9:28 pm

Yep, sure was a revelation. Problem is I've now been fixated on looking at bloody bulbars, none of which have the same opening as a factory bar. Never even needed to think about this crap with the MN, but have been told that the MQ onwards run warmer for that dreaded DPF...

RHK - yep, been looking at that. Two decent vents in the front protection plates - one of which I think was part of the bar. I have actually moved the rego plate up a fraction, so now has the whole winch opening also.
Still think this is absolute crap having to chase marginal increases like this as I just dont remember the MN fluctuating much...
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Re: MQ Normal Operating Temp??

Postby seb7701 on Sun Dec 22, 2019 8:30 pm

To continue the saga- just established that the car runs cool as a cucumber around town, like 83-85 degrees on hot day and then actually gets hotter on the highway with supposedly more airflow??? (Like 96-97deg ?)

In contrast, was driving a MN yesterday which was the exact opposite- 88-89 on Hwy and early 90’s when slowing through towns. What’s going on?? I would have thought Hwy running is always going to be cooler??
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Re: MQ Normal Operating Temp??

Postby NowForThe5th on Mon Dec 23, 2019 3:03 am

Aerodynamics don't start to work until over 80km/h when more air gets pushed up and over to reduce drag.
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Re: MQ Normal Operating Temp??

Postby seb7701 on Mon Dec 23, 2019 12:07 pm

Good point, but that means that air is being diverted away from the front to reduce drag?
I really did think things should be cooler with the extra airflow??
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Re: MQ Normal Operating Temp??

Postby seb7701 on Mon Jan 06, 2020 5:11 pm

On the off chance anyone’s curious about bullbars and airflow, here’s some proof of airflow issues.
I today visited the Mitsubishi dealer with EDS in hand to try it on some non-bar equipped vehicles. After checking mine over in conjunction with a 15K km service, they found it to be running 95 degC on the Hwy (30deg OAT)

I then tried a well-worn MQ manual (no bullbar) with 180,000km on the clock- rock steady 89 degrees on the Hwy (91 up hill).
Lastly, tried the dealer’s own MR auto (no bullbar) Worst thing I could have done - 81deg MAX uphill and 75deg around town!!!

So, looks like the Ironman bar is coming off.
Anyhow have experience with smart bars lately?
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